Explosive engine



July 29 1924.,

T. KEENAN EXPLOSIVE ENGINE Filed Oct. lO. 1921 Wzomasfeem an Patentedjuly 29, 1924..

unirsi) STATES v1,.'ioarfw THOMAS KEENAN, 'or BnoOxLYN,'NEw vonk; AssieNon 'ifo xiniNAN4 risroN SLEEVE i' AND ENGINE CORPORATION, onNnw YORK, N. y., A conronA'i'IoN or NEW Yonx.

nNGnm Application nieu ottone; io, 1921. rsei-m1 Na 506,041.

To all whom z't mag/concern:

Be it known that I, TiioMAsKnENAN, a

citizenk ofy the United States, residing at Brooklyn, in the county of Kings andState -of New York, have invented new and useful 'Improvements inl Explosive. Engines, of

` ing compartment.

Another objectof the-invention is to pro vide a piston with a sleeve to accurately fit into the cylinder thereby keeing it in perfect alignment and compensating for the expansion and contraction of the piston.-

Another object of the invention is to'prevent endwise inovementof the wrist-pin so: that it cannot get into contact with thebore to injure or score it by the pin scraping along the interior of the cylinder.

The invention resides more particularly 1n the novel combinations hereinafter described and claimed, reference being made to the accompanying drawing in which:

' Figure \1 represents a vertical section of an engine embodying this invention.'

Figure 2 is a horizontalsection taken along the line-'2 2 of the same.

Figure 3 is aV sectional side elevation of the piston on a larger scale. c

F1 res 4 and 5 are views like Figure 3 showing modifications of the piston. Figure 6 is an inverted plan view of Figure 5. 1

In the drawin the 'numeral 10 desi ates a cylinder Whic is bolted-to a cra -case 11 having ai'r inlets 12 to circulate air in the case and cool a piston 14 slidingly yarran ed in the cylinder. A crank 15 mounted in t e case transmits*reciprocatingmotion to thel piston by means of a connecting rodv 16 pivoted to the lower portion of the 'piston by meansof a wrist-pin 17 extending transversely through the cylinder. The central part of the .pin carries a ball 18 on which caused w en the crank shaft is out of alignmentqwitli the piston.

As` indicated in Figures 1 and 3 the piston carries a sleeve 19 having interior annular bosses 20 made to jam against theperiphery ofthe cylinder. A nut 21 screwed to the top of-tlie piston clamps the sleeve between l it .and` avange l22 formed at.the lower ,end

ofthe piston.k The boss portions of the sleeve are rovided with exterior grooves for the insertion of rings 24 to distribute oil or serve as packing. The lower end ofthe piston when down protrudes into the crank case to more readily ycarry up the oil. The

piston is preferablyjcast of aluminum and it is tubularhaving a head and provided with internal ribs 25 t'o stren hen it.

On the upper end` of t e cylinder is mounted a valve chamber 26 communicatingwith a. fuel or ringchamber 27' adjacent' to the top 'of the cylinder. Spring pressedl inlet and ,exhaust valves 28 and 29 are ac- -tuated in the usual way and respectivelyadmit a combustible :into the firing chamber and .exhaust the products of combustion after the explosion. `A carbureter 30 con.- nected to. a lgasoline tank vaporizes the fuel before it enters the valve chamber.' A tank 31 'containing water is connected to the upper portion of the cylinder. The water is converted into steam by theheat generated after it is drawn into the fuel chamber by .the .suction created by the down stroke of the iston so as to scavenge the cylinder by .mixing with the vaporized fuel.` The tank is provided with a vent normally closed by "a plug 3 2 to permit filling of the tank'. A

primercu Q33 controlled bya cock v34 is adapted w ena valve 35 is closed to force smal quantities 4of gasoline into the fuel chamber Where it is fired by a spark plug 37 tO accelerate the 'charge when the main supply -of combustible missesA fire.

The device 'for cooling the cylinder in- 'cludesy` a series of radial varies or fins-38 ex.

tendin longitudinally along the outside of the cy inder. A sleeve or ]acket 39..is arran ed toen lose the vanes so as to form oc ets or passages forconducting the air. ilhese pockets are connected to a conduit 40 whereby air is forcedby a 'pump or otherwise into the pockets through individual holes 41 -in the upperwall to the conduit.

the rod is mounted thus forming a universal. The `air ypasses from the upper ypart of the joint to revent uneven throw of the piston.

pocketsV into a series of tubes 42`leading from each pocket and extending up through the firing and valve chambers. In .this construction each f ocket receives a quantity of air to eiective ycool the cylinder and the tubes at the upper end by forming an annulus about the firing and valve chambers thoroughly absorb the heat generated by the explosionc As indicated in Figure 4 the sleeve. 19 is screwed on to the piston and the upper end. impnges on to a packing rin 44 pressing it against the lower portion or the flange 22 located at the upper end of the cylinder.

As shown in Figures 5 and 6 the interior portion of the piston is grooved or eorrugated so as to give a larger area of cooling surface inside of the piston. y The last mentioned piston is also provided with a ange,

22 at the top which, however, is made with grooves to carry a number of packing rings 4e. The sleeves of all the pistons form an annular air space between the bosses adjacent to the interior .of the cylinder so as to effectively-absorb the heat radiated from the walls of the piston. The sleeve also con- Lacasse? stitutes a cushionto eliminate the noise roduced by the piston against theylinder ore and any excessive V"expansion of the piston does not aeet the sleeve.

l claim:

An engine piston comprising a tubular headed member with flanged `and threaded ends, said member having its interior longitudinally grooved, a cylindrical sleevei 1nserted on the member with a bossV at the top andrbottom to coact with the periphery 'of the 'member and form an annular space, and a nut engaging the threaded member to force the end of the sleeve against the Harige.

In testimony whereof l have hereunto set my hand in the presence of two subscribing witnesses.

THOMAS KEENAN. Witnesses:

INnz M. Sonomis, WIILIAM Mnmn. 

